Rasp wheel



Oct. 21, 1941. H. v. JAMES 2,259,820

RASP WHEEL Filed March 18, 1940 INVENTOR f 2.1 fiheomK JAMES ATTORNE-Y Patented Oct. 21, 1941 UNITED STATES PATENT OFFICE RASP WHEEL Harold V. James, Denver, Colo.

Application March 18, 1940, Serial No. 324,657

1 Claim.

This invention relates to a rasp wheel and more particularly to the type of rasp wheel used for tearing the tread from pneumatic tire carcasses for retreading purposes.

The principal object of the invention is to provide a highly efficient construction for this purpose in which the portions subjected to wear can be easily, cheaply, and quickly removed and renewed.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efliciency. These will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a side elevation of the improved rasp wheel as it would appear in place on a shaft.

Fig. 2 is a longitudinal section therethrough.

Fig. 3 is an end view thereof.

Fig. 4 is an enlarged detail section through the wheel rim.

In the drawing, the shaft of a typical grinding or rasping machine is indicated at I0. This shaft is provided with a shoulder II and the extremity thereof is threaded, as indicated at I! and provided with a clamping nut I3.

The improved rasp wheel consists of three members, two of which are identical in construction so that it can be cheaply and easily manufactured. The wheel employs an outer annular, concave band I4 of less diameter at its mid-portion than at its end faces. The band is perforated over its entire area to receive a plurality of sharp, pointed members I5. The pointed members are provided with flattened heads I6 which prevent them from passing entirely through the band I4. Ordinary large carpet tacks have been found highly satisfactory for use as the pointed members.

The tacks are held in place in the band by means of two oppositely facing hub members II. The external faces of the hub members are contoured to correspond to the convex inner surface of the band I4. When the nut I3 is tightened, the two hub members are forced together against the shoulder II causing them to wedge themselves over their entire external surfaces against the heads of the tacks to tightly clamp the latter against the internal surface of the band and to rigidly maintain the projecting points in position.

As these points wear down, it is only necessary to remove the nut I3 and withdraw the hub members from the hand. All of the pointed members can then be tapped from place and quickly replaced with new ones after which the hub members are again inserted and clamped in place on the shaft I0.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claim,

without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

A rasp wheel comprising: a relatively thin, hollow rim sleeve of uniform thickness throughout, said sleeve being arcuately concave longitudinally and being perforated over substantially its entire area; a plurality of tacks projecting outwardly through said perforations with their heads lying fiat against the inner surface of said sleeve; and a hub member fitted into each extremity of said sleeve, the outer peripheries of said hub members corresponding in contour to the internal surface of said band and being of less diameter than said internal surface so that they may pass entirely within said sleeve to clamp the heads of said tacks against said surface.

HAROLD V. JAMES. 

